Cooldown Reduction (CDR) was a crucial statistic in League of Legends that reduced the cooldown time of champion abilities. It did not affect static cooldowns or on-target cooldowns unless specifically stated otherwise.

The basic formula for calculating cooldown reduction was: Base Cooldown × (1 − CDR ÷ 100)

CDR was capped at 40%, which could be increased to 45% with Cosmic Insight. The statistic had a gold value of 26.67 per point.

Sources of CDR:

Items:

• Basic items providing unnamed CDR
• Named CDR items including:
  • Archangel's Staff
  • Hextech GLP-800
  • Lost Chapter
  • Luden's Echo
  • Seraph's Embrace

Runes:

• Ingenious Hunter
• Ultimate Hunter
• Transcendence
• Cosmic Insight
• CDR rune shard

Neutral Buffs:

• Cloudbringer's Grace
• Crest of Insight

Special CDR Types:

Ultimate Ability CDR:

• Ultimate Hunter and Cloudbringer's Grace stacked additively
• Regular CDR stacked multiplicatively with ultimate-specific CDR

Item CDR:

• Cosmic Insight and Ingenious Hunter stacked additively
• Multiple copies of active items shared global cooldowns

Summoner Spell CDR:

• Available through Cosmic Insight
• Ionian Boots of Lucidity
• Howling Abyss aura

Maximum CDR Strategy: To reach 45% CDR efficiently:

1. Take Cosmic Insight and Transcendence (15% at level 10)
2. Purchase Ionian Boots of Lucidity (10%)
3. Buy one 20% CDR item (options ranging from 2700-3773 gold)

At level 1, the maximum achievable CDR with 500 gold was 15%, obtained through:

• Cosmic Insight (5%)
• Crest of Insight from Blue Sentinel (10%)

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